Black

In transparent color this has more the effect of a dark gray than a
brilliant black, such as is produced with body colors. When you want a
very dark black, it is better to use a little India ink with it. It is
used in the skies of landscapes when you wish a gray effect, or to
subdue a too strong blue color or red, and in foregrounds for rocks. In
connection with yellow it will make a sombre green for trees,
mountains, etc. In portraits it is used for the hair and eyes, in the
shadows around the mouth, and in drapery in connection with the other
colors.